how high above the base of your chassis is the top of your rollcage? i am just blowing the dust of my old copy of autocad to install on my laptop to design the cage, but as a starting point i just want to work out the average height. i am trying to keep it as low as poss because i have seen some 7 alikes with what looks like scaffolding stuck to the chassis its so high. i am limited being 6'2" though.
Best way is to sit in car and get someone to measure your head plus helmet height and add 2 inches. Mine is 40" high.
quote:
Originally posted by macc man
Best way is to sit in car and get someone to measure your head plus helmet height and add 2 inches. Mine is 40" high.
proper way to do it, is get something like a length of wood/pip/tube, and lay it on the bonnet. sit in the car with whatever you'll wear (eg helmet) and get a helper to hold the back end of the wood etc up, so it still rests on the bonnet. it should be high enough that your head is under the line. that way, if you do roll, the car should rest on the bonnet and roll bar, and your head should be clear
quote:
Originally posted by blakep82
proper way to do it, is get something like a length of wood/pip/tube, and lay it on the bonnet. sit in the car with whatever you'll wear (eg helmet) and get a helper to hold the back end of the wood etc up, so it still rests on the bonnet. it should be high enough that your head is under the line. that way, if you do roll, the car should rest on the bonnet and roll bar, and your head should be clear
quote:
Originally posted by blakep82
proper way to do it, is get something like a length of wood/pip/tube, and lay it on the bonnet. sit in the car with whatever you'll wear (eg helmet) and get a helper to hold the back end of the wood etc up, so it still rests on the bonnet. it should be high enough that your head is under the line. that way, if you do roll, the car should rest on the bonnet and roll bar, and your head should be clear
If done right then it will be comically tall... but at least you know it will work!
quote:
Originally posted by zilspeed
quote:
Originally posted by blakep82
proper way to do it, is get something like a length of wood/pip/tube, and lay it on the bonnet. sit in the car with whatever you'll wear (eg helmet) and get a helper to hold the back end of the wood etc up, so it still rests on the bonnet. it should be high enough that your head is under the line. that way, if you do roll, the car should rest on the bonnet and roll bar, and your head should be clear
Not strictly true.
I know we're not talking about MSA regs here, but let's stick with that anyway.
The line should be between the top of the roll bar and the front of the structure of the vehicle. In a Locost or similar, this is unlikley to be either the bonnet or the nosecone.
It's more likely to be the chassis member below that.
For the purposes of calculating roll bar height, that makes quite a difference.
quote:
Originally posted by scootz
If done right then it will be comically tall... but at least you know it will work!
quote:
Originally posted by iank
quote:
Originally posted by scootz
If done right then it will be comically tall... but at least you know it will work!
Unless you have a full cage, at which point the whole thing moves down considerably.
It's a difficult one as cages that look good are rarely effective.
Then you just need helmet+2inches to a line drawn between the front and rear hoops.
Not easy to estimate without having the seat+runners sorted unfortunately.